2 sentences

1. 面对困难，我们绝不能气馁。

   miàn​duì kùn​nan, wǒ​men jué bù néng qì​něi.

   We must never lose heart in the face of difficulties.

   Source: Dong Chinese Dictionary

2. 胜不骄，败不馁。

   shèng bù jiāo, bài bù​něi.

   Not conceited in victory, nor discouraged in defeat.

   Source: Dong Chinese Dictionary